Reversible mill



Nov. 10- l925- .L'cRlTEs REVERSIBLE MILL Filed March s. 19:24

-tWo sets of patterns, jigs,

lPatented Nov. 1,0, 1 925.

.JOE CRITEIS, OF EVANSTON, ILLINOIS,

q 1,560,76a PATENT oFFleE.

AssiaNon 'To RAYMOND. Bn'o'rHns IMPACT PULVEItIZER C0., 0F CHICAGO, ILLINOIS, A CQBJPQBATION OF ILLINOIS.

REVERSIBLE MILL.

' I Application fil-ed March 8, 1924. Serial 110,697,893.

TOfiZZ whom it may] concern: i

Be it known that-I, Jen Carries, a 'citizen Aof the United States, residing at Evanston,

in the' county of Cook and State of Illinois,

.have invented certain new and useful Improvements in Reversible Mills, 'of which the following is a specification.

My Yinvention relates to pulverizing mills 'of the impact or beater type, in which a plurality of swing hammers or otherA beaters are carried b la shaft at high speed in 'comparatively c ose proximity to the circumferential Wall of the beater chamber, but out of contact therewith, the pulverizing being effected by the impact lof the beaters on the particles being pulverized and by the .inv pact of the particles upon' the lwall of the chamber and Without agrinding eect,'and

it is the-principalobject of my invention to a construction of'mill of this type sired. l Y

For the'manuf'act-ure heretofore, it has been necessary to provide and other acces sories-for the production of right hand and left hand mills, thusincreasing the direct cost of the production of the mills and in? creasing the overhead inthe way of storage Y and upkeep of such accessories. Moreover,

in the useof such mills 4as that shown in the ',drawing, the swing hammers become worn in use morerapidly at .one point than at another so that it becomes advisableto turn thehammers so as to bring a different face.

in advance. As will bel-readily understood,

these diiiiculties 'are taken care. of fully and completely by the provision of theA reversible form of'mill;V I

It is one of the objects of my invent-ion to improve mills of this generaltype in sundry details hereinafter pointed out. :The preferred means by which I have accomplished my objects areil'lustrated in the drawings and are hereinafter specifically described.

That which I believe to, befnev'v and desire to cover by- Letters Patent is set forth in the claims.

In the dr'awingfe- Fig.- 1- is a central vertical section through 4an embodiment of my invention.

Fig. 2'is a central Avertical section through the beater chamber of Fig. 1f, being substantia-lly a 'sectiontaken on line 2- 2` of Fig.

of'mills of-this type f Fig. 3 is a central vertical section through the fan chamber, being substantially a se'ction taken on line 3-3 of Fig. 1.

Fig. 4is 'a view, more' or less diagrammatic, showing the means fordriving thel AReferring' to the" several figuresjof the drawing, it Will bexseen that the mill coni-l prises a feeding chamber 10, a beater chamber 11 provided by a housing'12, a fan chaniber 13, and asha-ft 14extending through said chambers, suchshaft 14 being supported b v bearings 15 and being driven in either direction as desired by the use of a coupling 16 which connects the shaft 14 lwith 'the shaft 17 of a reversible motor 18.

Above the, feeding chamber 10, there 1s mounted a hopper'lQ to which material to he f vpulverized is delivered from any suitable source, the slide valve 20 being provided for closing the opening 'to'the chamber 10, 'as maybe desired. Below the level of the hop.- per 19, there is located a pocketed feedv wheel 21, of any suitable type, mounted on a shaft 22 so as to rotate in clockwisevdirection in Fig. 1, as hereinafter describe-d, Between the feed Wheel 21 and the hopper 19, there is pivotally mounted a. flap 23, the position of which is adjustably controlled b A a link 2l and pin 25, as will be readily un 'erstood A The .feed Wheel 21 is'driven, in t-hecon.- struction shown, by meansof ratchet wheels 26 (see Fig. 4) mounted on the ends of the'. shaft 22. Loosely ymounted on the sha-ft 22 adjacent to each of the. ratchet 'wheels 26,

there is a bell crank lever 27, one -arm of' each of said'levers 27 being provided with 4a pawl 2.8l adapted on'the oscillation' of the bell crank to' give intermittent rotation to lthe adjacent ratchet. wheel and thus to rotate the feed Wheel 21. The bell crank le-4 A37 from the shaft 14.

The arrangement of thev gearing is such `that when. the shaft 14 is rotated in either direction -at a speed of approximately 1300 vers 27 are oscillated by pitmans 29 conv revolutions per minute, the feed wheel 21 ber 11, such hammers or beaters being pivoted close to the axis of the shaft by means of collars 39 and pins 40. In the construction shown, the pins 40 are held in posltion by removably mounted rings 41, the arrangement being such that all of the pms 40 are capable of being removed from normal position upon the removal of one of the rings 41. By the use of this construction, the assembling of the mill originally is very greatly facilitated, and the trouble and expense of repairs are greatly reduced. Moreover a hammer 38 cannot become disconnected from the shaft except bythe complete loosening of one of the rings 41, and this loosening of the ring 41 would be promptly noted by an attendant before serious damage to the mill could be done.

As is best shown in Fig. 2,'the housing for the beater chamber 11 comprises a base plate 42 provided with a. thin liner 43. Rising from the base plate 42, there is a frame work comprising a plurality of castings 44 suitably secured together for forming the body of the housing. Upon the inner face ofthe wall made up by the castings 44, I have provided a steel plate or plates 45 for strengthening the wall. face of the steel reinforcement 45, I have provided liners 46 as is clearly shown in F ig. 2. The inner faces of the liners 46 are located in fairly close proximity to the outer ends of the hammers 38 in the position in which such hammers are normally held by centrifugal force during the operation of the machine.

In order to trap heavy bodies, not readily crushed, such as pieces of metal, pockets 47- and 48 are provided at the bottom of the chamber 11 at two different points about the inner face of the chamber., The two pockets are provided for alternative use, depending upon the direction of rotation of the shaft 14 and the parts carried thereby, the pocket 47 being adapted fo-r use when the shaft is rotated in counter-clockwise direction in Fig. 2, while the pocket 48 is adapted for use when the` shaft is rotated in the opposite direction. In the construction shown, means is provided for closing the pocketv not in use, such closing means being in the form of an adjustable liner member 49 as hereinafter described. As is clearly Ishown in Fig. 2, removable plates or doors 5() and 51are provided adjacent to the pockets 47 and 48, such doors 50 and 51 being interchangeable. provided on its inner face with a thin Upon the inner The-doorV -is liner member 52. The door 51, on the other hand, is utilized for the mounting of the adjustable liner 49, such liner being pivotally mounted by meansfof a pin 53 upon ythe lnner 'face of the door 51. The door 51 is also provided with a set screw 54 for limiting the upward movement of the adjustable liner 49 about the pin 53, and with.

a wedge 55 adapted to rest between the liner 49 and the liner 43 in adjustable position for varying the distance between the liner 49 and the ends of the hammers 38. The Wedge 55 is also available for raising the liner 49 to compensate. for wear u on the liner member. The wedge 55 is hel in adjusted position by means of a screw threaded part 56 which is adjustably'mounted in the door 51.

As will be readily understood, when the shaft 14 is to be driven in counter-clockwise direction in Fig. 2, the door 51 is employed in the position shown in said figure, holding the adjustable liner 49 in position vwithin the pocket 48 and servingin this position to close such pocket, the door 50 being employed at the right in Fig.' 2, as shown.'

When, however, the direction of rotation of the shaft 14 is to be reversed, the doors 50 and 51 are interchanged, as shown by Fig. 5, the adjustable liner 49 in the changed position being adapted to close the pocket 47 while leaving the pocket 48 open for use.

As will be readily understood, by mounting the adjustable liner 49 upon the removable door 51, means is provided for a ready renewal of'the liner section, as may be necessary, by reason of wear upon such parts. As is well understood by those skilled in the art, the ineness of the pulverization is controlled in part by the position of the adjustable liner 49, an adjustment of the liner inwardly toward the path of thev hammers 38 serving to increase the fineness of pulverization.

As will also be readily understood, in whichever position the plate 50 is located, such plate is readily removable for the removal of the foreign bodies from the adjacent pocket 47. or 48. l

As is clearly shown in Fig. 1, lthe cham- -ber 11.at its discharge side is provided with a conical extension 57 in concentric position about the shaft 14. Within the conical extension 57,' there ismounted a regulator comprising four radially disposed plates 58 mounted on the shaft 14 so as to rotate therewith. The ends of the plates 58 extend to within a short distance from the inner face of a conical ring 59 which is secured on the inner face of the extension 57, the ends of the plates 58 being diagonally disposed to correspond to the inclination of the -face of the ring 59. The plates 58 are preferably adjustable radially with respect gitudinally of the shaft so as to vary the distance between the ends of the plates and the face of the ring.

llithin the fan chamber 18, there is mounted a high pressure fan having long blades GO by reason of which the fan is adapted to deliver a small volume of air at high pressure. As is best shown in Fig. 3, the plates of the fan are held in radial position upon the shaft 1-1 by means of a plurality of angles 61 which are secured together by means of rivets and bolts for holding the blades in rigidposition with respect to the shaft 1-1- As is clearly shown in said Fig. 3, the chamber 13 is provided with a radially disposed discharge duct G2, to which is connected a conduit G3, the arrangement being such that upon the rotation of the shaft 1l in either direction air is drawn into the chamber 13 about the shaft'll and forced out through the duct G2 and the conduit 63.

In the construction shown, the air is admitted to the chamber 13 through an opening G1. the effective size of which is controlled by the slide (S5. Air is also admitted to the chamber 13 through the beater chamber 11,'

to which the air is admitted through an inlet pipe 66 from any suitable source. A baffle plate (3T is provided in the pipe 66, and an adjustable damper 68 is provided for controlling the amount of air entering through the pipe 6G, as will be readily understood. The air admitted through the opening G-l and through the vpipe 66 may be either atmospheric air or pre-heated air, as may be desired.' As will be readily understood, by suitable control of the slide valve (S5 and the valve GS, the amount of air forced out through the pipe`63 can be controlled, so as to deliver through the pipe 63 a volume of air at high pressure. At the same time, the proportion of the air entering the chamber 13 from the chamber 11 and that entering through the opening 64 can be controlled so as to provide a large stream of air through the beater chamber 11, such large stream of air being of low pressure and low velocity.

The arrangement and construction of the pulverizing means in the beater chamber 11, the regulator Within the conical extension 57, and the high pressure fan Within the fan chamber 13 are thus seen to be such that the operation of such parts is the same whether they be revolved in one direction or the other. The driving means for the feed Wheel. 21, however, is such that such feed Wheel is driven in the same direction regardless of the direction of rotation. ofthe shaft 14.

It will be thus apparent that the feeding.

means, the pulverizing means, the regulating means and the fan by which the pulverized material is delivered from the beater chamber are all capable of just as effective operationA upon the rotation of the shaft 14 in one direction as that when the shaft is rochange which would be made in the entire 'mill when it is desired to reverse, the direction of rotation of the mill is the change in` position of the adjustable liner 49 from the position in Fig. 2 to that shown in Fig. 5, or vice versa, which change in position can be very quickly and easily effected.

ln operation, coal or other material to be pulverized is supplied to the hopper 19 by anyv suitable means, not shown. The amount of the feed to the Wheel Q1 is cont-rolled by the position of the link Q4 and the flap 23, as is Well understood in the art. lVith the feed wheel 21 rotating at the desired speed in clockwise direction in Fig. 1, the material is admitted in measured quantities to the beater chamber 11. i

1With the hammers 38 being carried about the shaft 14 at the rate of 1800 revolutions per minute, there is a very marked beating effect upon the material and it is forced about the inner face of the chamber 11 with t-he hammers. As Vwill be readily understood, the largest and heaviest particles of the material vvill be most affected by centrifugal force and will accordingly be brought into contact with the. liner members 46. By regulating the position of the plates 58 of the regulator radially with respect to the shaft 14, and likewise by adjusting the position of the regulator longitudinally of the shaft 1/1, the iineness of the pulverization is controlled in part, as is well understood. As the pulver-ization continues, the finest particles of the material are carried out of the chamber 11 by the stream of 10W pressure air, such air and pulverized particles being forced outwardly through the duct 62'and the pipe 63, as is Well understood.

Then the hammers 38 become worn on one face so as to make it desirable that the direction of rotation of the mill be changed, or when for any other reason .it is desired to change the direction of rotation, the posi-y tion of the liner 49 can very quickly be shifted, and the mill can be driven in the opposite directionwithout further change by merely reversing the direction of rotation of the motor 18.

While it is desired that the form of construction be employed substantially as illustrated in the drawing, it will be understood that the invention is not to be limited to the detailed form of construction precisely as illustrated, except as the same may be hereinafter specifically claimed, since changes may Well be made in the particular formv of construction Without departing from the spirit of the invention.

I claim: v j

1. A pulverizing mill of the impact type which is reversible Without adjustment or replacement of any ofthe rotary parts, comprising a chamber, a shaft therein, and

lll)

which is reversible without adjustment or'rechamber for delivering placement'of any of the rotary parts c'om- "terial from the chamber.'

f rial fi'oin `the chamber.

means operative by the shaft rotating in for feeding to the chamber the material to either direction for positively feeding to the be pnlverized, means operative by the shaft chamber the material to be pulverized, for rotating in either direction for pulverizing pulverizing the material, and for delivering the material, and a reversible fan driven by the material from the chamber. "said shaft for creating a draft of air through 2. A pulverizing mill of the impact type the chamber for delivering the pulverized which is reversible without adjustment or icmaterial from the chamber. placement of any of the rotary parts coin- 8. A pulverizing mill of the impact type prising a chamber, a shaft therein, means for which is reversible without adjustment or feedingy to the chamber the material to be i'eplacen'ient of any of therotary-parts compulverized, and means mounted on the shaft prisiiig a chamber, a shaft therein, means and rotatinv therewith operative by rotafor feeding to the chamber the material to tion of the s aft in either direction for pul-4 verizing the material and other mounted on the shaft for delivering the mathe material, `and la reversible fan vmounted :terial from the chamber. .directly upon the shaft and rotatable there- 3. A pulverizing mill of the impact type with for creating a draft of air through. the

` the pulverizedLmaprisinga chamber, a shaft therein, means opv' 9.--A -pulverizing mill of the impact type erative by the shaft rotating ineitherdirecwhich isi'eversible Without adjustment or bepulverized, means operative by the shaft v means rotating in either direction for pulverizing tion for feeding to the chamber the material replacement of any of the rotary parts eomto be pulverized, and means mounted on the "prising a chamber, a shaft therein, means shaft and rotating therewith operative by for feeding to the chamber the material tobe rotation of the shaft in either direction for pnlverized, means operative by the shaft ropulverizing the material and for deli-vering tating in either direction for pulverizing the it from the chamber. material, a fan chamber communicating with 4. A pulverizing mill ofthe impact type, the first named chamber and having a ralWhich is reversible Without adjustment or redially disposed discharge duct, and a fan placement of any of the rotary parts comdriven by said shaft .in said fan chamber prising a chamber, a shaft therein, means for adapted upon rotation in either direction to feedin to the chamber the material to be create a draft of'air through the chamber pulverized, and three separate means operlfor delivering the pulverized material from ative by the shaft rotating in either directhe chamber. v

tion for respectively pulverizing the mate- 10. A pulverizing mill of the impact type rial, regulatin the fineness of the pulveriwhich is reversible Without adjustment or zation, and de ivering the pulverized material from the chamber. prising a chamber, a shaft therein, a feeding 5., A pulverizing mill of the impact type device for delivering to the mill the matewhich is reversible Without adjustment or rial to be pulverized, operative connections replacement of any of the rotary parts coinbetween the sha-ft and the feeding device for prising a chamber, a shaft therein, means for driving the feeding device in the same direcfeeding to the chamber the material to be tion regardless of the direction of rotation pulverized, and three separate means mountof the shaft, and means operative by the ed on the shaft and rotating therewith op- Shaft rotating in either direction for pulerative by rotation of the shaft in either diverizing the material and for delivering it rection for respectively pulverizing the mafrom vthe chamber.

terial, regula-ting the ineness of the pn'lverill. A pulverizing mill of the impact type zation, and delivering the pulverized -mate- Which iis-reversible without adjustment or replacement of any of the rotary parts coni- 6.' A pulverizing mill of the impact type prising a chamber, a shaft therein, a feeding replacement of any of the rotary parts com` Which is reversible Without adjustment or device for delivering to the mill the matereplacement of any of the rotary parts comrial to be pulverized, operative connections risin a chamber a shaft-therein and four com rising a crank and itman between the v separate means operative bythe shaft roshaft and the feeding device for driving the tating in either direction for respectively` feeding device in the same direction regardfeeding to the chamber the material to be less of the direction of rotation of the sha-ft, pulverized, pulverizing the material, regulatand means operative by theshaft rotating in ing the iineness of the pulverization, and deeither direction for pulverizing the material livering the pulverized material from the and for delivering it from the chamber. chamber. Y 12. A reversible pulverizing mill of the 7. A pulverizin mill of the impact type impact type comprising a chamber, a shaft which is reversib e Without adjustment or therein, means for feedingto the chamber replacement of any of the rotary parts comthe material to be pulverized, means operaprising a chamber, a shaft therein, means tive by the shaft rotating in either direction for pulverizing the material and for delivering it from the chamber, said chamber being arranged to provide a pocket in either of two places for receiving foreign bodies, and means for closing either of sald pockets depending on the direction o f rotation of the shaft.

13.- A reversible pulverizing mill of the ilnpact type comprising a chamber, a shaft therein, means for feeding to the chamber the material to be pulverized, means operative by the shaft rotating `in either direction for pulverizing the material and for delivering it from the chamber, said chamber being arranged to provide a pocket 1n either of two places for receiving foreign bodies, and a liner member for closing either of said two pockets depending on the direction of rotation of the shaft.

14. A reversible pulverizing mill of the impact type comprising a chamber, a shaft therein, means for feeding to the chamber the material to be pulver-ized, means operative by the shaft rotating in either direction for pulverizing the material and for deliv cring it from the chamber, and a pivotally mounted liner member adapted to be adjusted to extend in either direction from its pivot along the path of hthe pulverizing means corresponding to the direction of revolution of the pulverizing means about the shaft.l

15. A reversible pulverizing mill of the impact type comprising a chamber, a shaft therein, means for feeding to the chamber the material to b e pulverized, means operative by the shaft rotating in either direction for pulverizing the material and for delivering it froln the chamber, and a pivotally mounted liner member adapted to be adjusted to either of two positions so asto extend in either direction from its pivot valong the path of the pulvcrizing means corresponding to the direction of revolution of the pulverizing means about the shaft.

16. A reversible pulverizing mill of the impact type comprising a chamber, a shaft therein, means for feeding to the chamber the material to be pulverized, means operative by the shaft rotating in either direction for pulverizing the material and for delivering it lfrom the chamber, said chamber be'- ing arranged to provide a pocket in either of two places for receiving foreign bodies, liners extending circumfeentia ly clear about the interior of the chamber in close proximity to the path of the pulverizing means except for the space provided for the pockets, and means for closing either of said pockets depending on the direction of rotation of the shaft.

17. A reversible pulverizing mill of the impact type comprising a chamber, a shaft therein, means for feeding to the chamber the material to be pulverized, means operative by the shaft rotating in either direction for pulverizing the material andl for delivering it from the chamber, said chamber being arranged to provide a pocket in either of two places for receiving foreign bodies,l liners extending circumferentially clear about the interior of the chamber in close proximity to the path of the pulverizing means except for the space provided for the pockets, and a removable hner member for closing either of said pockets depending on the direction of rotation of the shaft.

18. A reversible pulverizing mill of the impact type comprising a chamber, a shaft therein, means for feeding to the chamber the material to be pulverized, means operative by the shaft rotating in either direction for pulverizing the material and for delivering it from the chamber, said chamber being arranged to provide a pocket in either of two places for receiving foreign bodies, removable door in the wall of the chamber affording access to the pockets for the removal of the foreign bodies, and means for closing either of said pockets depending on the direction of rotation of the shaft.

19. A reversible pulverizing mill of the impact type comprising a chamber. a shaft. herein, means for feeding to the chamber the material to be pulverized, means operative by the shaft rotating in either direction for pulverizinfY the material and for delivering it from the chamber, said chamber being arranged to provide a pocket in either of two places for receiving foreign bodies, interchangeable doors in the Wall of the chamber affording access to the pockets for the removal of the foreign bodies, and a. liner member on the inner face of one of said doors adapted to close said pockets alternatively depending on the position of that door as controlled by the direction of rotation of the shaft.

JOE CRITES.

mil 

